/Engine/Source/Runtime/CoreUObject/Public/UObject/LinkerLoad.h
; Keep both classes around, but convert any existing instances of that object to a particular class (insert into the inheritance hierarchy ;ActiveClassRedirects=(OldClassName="MyClass",NewClassName="MyClassParent",InstanceOnly="true")
static void CreateActiveRedirectsMap ( const [FString](API\Runtime\Core\Containers\FString) & GEngineIniName )